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《Plant Protection》 2014-03
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Cytological analysis of compatible interactions between rubber tree and Oidium heveae

Wan Sanlian;Liang Peng;Liu Wenbo;Zhang Yu;Miao Weiguo;Zheng Fucong;Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources/College of Environmental and Plant Protection,Hainan University;  
Powdery mildew,a disease caused by Oidium heveae Steinm.is one of the most important leaf diseases that affect rubber tree plantations.Yet,at present there is a lack of systematic cytological research on the infection process and host-pathogen interactions.This study used a combination of various staining techniques and microscopy to observe the O.heveae infection process and the cytological changes in the infected leaves associated with host resistance response.The infection of O.heveae in the host developed through 5 crucial time points: conidia germination peak at 4 hours post infection(hpi),appressoria formation peak(8 hpi),penetration structure(primary haustoria)formation peak(15 hpi),secondary hyphae formation peak(24 hpi)and conidiophore formation peak at 5 days post infection.Prior to haustorium penetration into the host cells,the energy for the process came from conidium's own energy reserves.After the formation of pathogen's primary haustoria,in response to pathogen penetration,the rubber tree leaves initiated resistance reactions,including reactive oxygen burst and formation of calluses and papillae.Reactive oxygen species played an important role in the rubber treepathogen interactions.Low ROS levels in the rubber tree leaves allowed the development and penetration of O.heveae.In contrast,high levels of ROS and resultant oxygen burst prevent further pathogen expansion.The development of O.heveae infection in the host proceeded through5 crucial time points,including the initial peri-od of pathogen infection,latent period and post-infection period.In the leaves of rubber tree,an early phase of compatible host-pathogen interactions and later phase of incompatible interactions preserve the balance in the evolution of obligatory host-pathogen relationships.
【Fund】: 国家重大基础研究计划(2011CB111612);; 国家自然科学基金(31160359);; 国家农业产业技术体系建设专项(CARS-34-GW8);; 教育部博士点基金(20104601110004);; 海南大学科研启动资金(kyqd1006)
【CateGory Index】: S763.7
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